On 18/06/18 21:53, Rob Herring wrote:
On Mon, Jun 18, 2018 at 2:08 PM, Niklas Cassel niklas.cassel@linaro.org wrote:
On Mon, Jun 18, 2018 at 08:48:32AM -0600, Rob Herring wrote:
On Mon, Jun 18, 2018 at 6:39 AM, Niklas Cassel niklas.cassel@linaro.org wrote:
On Mon, Jun 18, 2018 at 12:06:42PM +0100, Mark Brown wrote:
On Thu, Jun 14, 2018 at 01:11:36PM +0200, Niklas Cassel wrote:
of_platform_device_destroy is only defined when building with CONFIG_OF=y. Add a depends on OF.
Is it sensible that of_platform_device_destroy() is only defined when building with CONFIG_OF=y?
I'm redirecting that question to the device tree maintainers.
There are a few of_* functions in include/linux/of_platform.h that are only defined when CONFIG_OF=y:
of_platform_device_create() of_platform_device_destroy() of_platform_bus_probe() of_device_alloc()
Rob, Frank, do you want me to create static inline dummy versions of these?
No, because generally you should not be using these functions directly. Yes, there are some users, but if you look at the tree, there are few or isolated (PowerPC) users. Using of_platform_populate/of_platform_depopulate is preferred.
of_platform_device_destroy() is also used by sound/soc/qcom/qdsp6/* which is why I suggested this patch: https://marc.info/?l=alsa-devel&m=152932497413567 that adds "depends on OF" for SND_SOC_QDSP6 in sound/soc/qcom/Kconfig.
Or do you think that a better solution would be to modify sound/soc/qcom/qdsp6/* so that it instead uses of_platform_populate()/of_platform_depopulate()?
Yes, that is preferred. However, that won't work here because the child nodes don't have compatible strings. Maybe we should add them as this all just went in. That would also allow DT based module autoloading to work (which I don't think would currently). Really, as is, of_platform_device_create isn't needed here and you could just use platform_device_register_simple instead. The child driver would have to get the DT node pointer from the parent device instead.
compatible was the reason why I started using of_platform_device_{create,destroy} apis. As you said we could also do it with simple platform device too.
I think adding compatible seems to be better option here along with of_platform_populate()/of_platform_depopulate(), I will try this!
thanks, srini
But if you want to add empty functions for just of_platform_device_{create,destroy}, I guess that is fine.
Rob